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检索条件"主题词=Modulation coding"

共 7024 条记录，以下是221-230 订阅

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Distributed video coding of Wyner-Ziv frames using Turbo Trellis Coded modulation

Distributed video coding of Wyner-Ziv frames using Turbo Tre...

引用

IEEE International Conference on Image Processing

作者： W.A.R.J. Weerakkody W.A.C. Fernando A.B.B. Adikari R.M.A.P. Rajatheva School of Engineering and Design Brunei University Uxbridge UK Telecommunications Programme School of Engineering Asian Institute of Technology Thailand

In this paper, we present a novel distributed video coding algorithm based on turbo trellis coded modulation (TTCM). As in the conventional turbo based Slepian-Wolf encoder, quantised information is applied to the TTCM encoder and parity bits are generated from both constituent encoders. However, TTCM symbols are not generated at the encoder since they are not sent to the decoder. Parity bits produced by the TTCM encoder are stored in a buffer and transmitted to the decoder upon request. TTCM symbols are generated at the decoder and these symbols are passed to the TTCM decoder for demodulation. Experimental results show that the proposed TTCM based codec can improve the PSNR by up to 6 dB at the same bit rate with less memory compared to the turbo coded distributed video codecs.

关键词： Video coding modulation coding Decoding Design engineering Buffer storage PSNR Turbo codes Video codecs Videoconference Monitoring

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Adaptive coding and modulation using Reed Solomon codes for Rayleigh fading channels

Adaptive coding and modulation using Reed Solomon codes for ...

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Eurocon

作者： K.M.S. Soyjaudah B. Rajkumarsingh Electrical and Electronic Engineering Department University of Mauritius Reduit Mauritius

ISBN: (纸本)0780364902

An adaptive forward error control and modulation scheme is proposed for slow Rayleigh fading channels. The adaptive scheme employs a family of RS codes of different rates and multiple phase shift keying (MPSK) modulation schemes according to the states of the channel. This uses a channel estimator to select the most appropriate codulation (coded-modulation) scheme. Simulation results show that the adaptive scheme gives significant improvement in the BER and throughput performance.

关键词： Adaptive coding modulation coding Reed-Solomon codes Programmable control Adaptive control Error correction Fading Phase shift keying Phase modulation Bit error rate

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Exploiting the synergies of circular simplex turbo block coding and wavelet packet modulation

Exploiting the synergies of circular simplex turbo block cod...

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MILCOM, Military Communications Conference

作者： E. Kjeldsen J.C. Dill A.R. Lindsey Scientific Research Corporation Atlanta GA USA Ohio University Athens OH USA Air Force Research Laboratory Rome NY USA

This paper describes an experimental implementation of an interference avoidance waveform, suitable for mobile or fixed wireless channels, and comprised of orthogonal signaling using wavelet packets in cohesive combination with a multidimensional channel error coding technique. The patent pending adaptive waveform, known as circular simplex turbo block coded wavelet packet modulation (CSTBC-WPM), possesses an unrivaled time-frequency localization and agility capability for avoiding joint narrowband/impulsive interference patterns. Excision of residual interference at the receiver is facilitated by isolation to a sparse number of time-frequency cells and removal using energy thresholding. Moreover, the time dilation of symbols in the WPM subbands is useful in mitigating the adverse effects of multipath-induced, frequency-selective fading. For an even more potent countermeasure to nonGaussian interference sources and channel propagation anomalies, the patent pending CSTBC forward error correction component is distinctly mapped onto the orthogonally multiplexed WPM symbols and interleaved to exploit the subband frequency diversity. The shorter block sizes of CSTBC provide a bit error rate performance competitive with turbo product coding's large code blocks, approaching the Shannon limit but with considerably lower latency (up to 20-fold improvement).

关键词： Block codes Wavelet packets modulation coding Interference Time frequency analysis Multidimensional systems Narrowband Fading Forward error correction Frequency diversity

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Performance analysis of a slotted-ALOHA network using error correction and error detection coding with BPSK modulation

Performance analysis of a slotted-ALOHA network using error ...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： J.P.M.G. Linnartz M.W.A. Groenewegen R. Prasad University of California Berkeley USA Delft University of Technnology Delft Netherlands

The performance of a slotted ALOHA-network in a slow Rayleigh-fading channel for mobile data communications is investigated considering error correction and detection coding with binary phase shift keying (BPSK) modulation. The performance is measured in terms of receiver error probability and throughput. An enhanced performance is obtained by using error correction coding. In spite of the use of error correction coding, a packet can be in error, i.e. the receiver erroneously detects a codeword that none of the terminals transmitted. Bounded distance decoding can be used effectively to reduce the packet error probability. A comparison of the performance is presented for a specific code with equal Hamming distance d/sub min/, exchanging between the error correcting and error detecting capability of that code. Also, the effects of signal carrier detection on receiver error probability and throughput are investigated.< >

关键词： Performance analysis Error correction codes Error probability Binary phase shift keying Throughput Rayleigh channels Data communication Phase detection Phase modulation modulation coding

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Opportunistic Scheduling and Adaptive modulation in Wireless Networks with Network coding

Opportunistic Scheduling and Adaptive Modulation in Wireless...

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IEEE Conference on Vehicular Technology (VTC)

作者： Seong-Lyong Gong Byung-Gook Kim Jang-Won Lee School of Electrical and Electronic Engineering Yonsei University Seoul South Korea

So far, many researches on network coding are performed with higher layer protocols such as MAC, routing, and flow control protocols without consideration of physical layer issues such as channel conditions of links. However, in wireless networks, the consideration of properties at the physical layer is important to improve system performance. Hence, in this paper, we study an opportunistic scheduling and adaptive modulation problem for wireless networks with network coding, which is a joint problem for MAC and physical layers. A similar problem was studied in considering an idealized system in which the data rate of each link is modeled with the Shannon capacity. They showed that to maximize the throughput of a transmission, the optimal subset of native packets that are encoded within a coded packet should be selected based on the channel condition at the destination for each native packet. Moreover, they also showed that it may not be the optimal selection to encode all possible native packets within a coded packet. In this paper, we consider a more realistic model than that of with practical modulation schemes such as M-PSK and MQAM. We show that the optimal policy that maximizes the throughput of a transmission is to encode all available native packets within a coded packet regardless of the channel condition at the destination for each native packet, which is a different conclusion from that of. However, we show that adaptive modulation, in which its constellation size in a coded packet is adjusted based on the channel condition of each destination node, provides a higher throughput than the scheme with fixed modulation, in which its constellation size is always fixed regardless of the channel condition at each destination node.

关键词： Adaptive scheduling modulation coding Wireless networks Network coding Throughput Physical layer Routing protocols Wireless application protocol Media Access Protocol Decoding

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Combined concatenated coding and modulation schemes using a redundant signal alphabet

Combined concatenated coding and modulation schemes using a ...

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IEEE International Conference on Communications (ICC)

作者： A. Chouly K. Fazel Laboratoires d'Electronique Philips Limeil-Brevannes France

Combined concatenated coding and modulation schemes using redundant signal alphabets are presented. A 2/sup m+1/-point signal constellation is employed to transmit m information bits per symbol (as in Ungerboeck schemes). To avoid a loss in spectral efficiency, the available redundancy (1 b/symbol duration) is shared between an outer error-correcting code and an inner code combined with a multidimensional modulation. The analytical performance of the schemes presented is evaluated on an additive white Gaussian noise (AWGN) channel. Simulation results indicate that 8 dB of coding gain at a bit error rate of 10/sup -11/ can be obtained with simple concatenated codes having a spectral efficiency of 3 b/s/Hz, thus achieving a better performance/complexity tradeoff than Ungerboeck codes.< >

关键词： Concatenated codes modulation coding AWGN Constellation diagram Redundancy Error correction codes Multidimensional systems Performance analysis Additive white noise Gain

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Digital chaotic coding and modulation in CDMA

Digital chaotic coding and modulation in CDMA

引用

AFRICON Conference

作者： Y. Soobul K. Chady H.C.S. Rughooputh University of Mauritius Reduit Mauritius

Conventional CDMA system uses PN sequences to spread user information. The number of shift registers used to generate them limit the lengths of these sequences. Good correlation properties can be achieved by Walsh codes and time-shifted version of PN sequences. The ability to predict future sequence is nevertheless possible, though difficult. Transmission therefore is not completely secured. Several other codes (Gold codes, Kasami etc) perform equally well as PN sequences, however it has been reported that these do not improve the security aspect of the system. Hence there is a need for a highly secure code that can be regenerated at the receiver and that can mimic PN sequences for spreading. In this paper, chaotic codes are investigated and their performance compared with the conventional PN sequences in an AWGN and Raleigh fading channel. The other type of spreading code which is the Walsh code uses its orthogonal property for user separation in the channel. This paper also investigates the behaviour of chaotic code in a multi-user situation. The auto and cross correlation properties of the spreading codes are also investigated. Chaotic codes are dependent on initial conditions and are continuous in nature. The undeterministic property of its amplitude from past sequences yields better security. Common modulation techniques (BPSK, QPSK) require higher SNRs to give similar performance in a multi-user environment. The use of QAM in order to improve BER whilst simultaneously inheriting secure property of chaotic codes is also investigated.

关键词： Chaos Digital modulation modulation coding Multiaccess communication Security AWGN Shift registers Gold Rayleigh channels Binary phase shift keying

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Turbo coding with differentially coherent and non-coherent modulation on non-fading and fading channels

Turbo coding with differentially coherent and non-coherent m...

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IEEE International Symposium on Information Theory

作者： G.S. White D.J. Costello Department of Electrical Engineering University of Notre Dame Notre Dame IN USA

This paper determines the performance of the turbo coding technique using M-ary (M=2, 4, 8) differentially coherent and non-coherent modulation schemes in both a non-fading and a Rayleigh fading environment. The constituent codes are convolutional and the specific modulation techniques include differential phase shift keying (DPSK), double differential phase shift keying (DDPSK), and non-coherent detection of frequency shift keying (FSK). Note that these modulations are all constant envelope, which is a desirable characteristic for hard limited channels such as transmission over satellite transponders. The emphasis is on constructing modulation/turbo coding schemes that perform at a lower required Eb/No and greater bandwidth efficiency than current coding approaches that use these modulation techniques. The turbo coding approaches developed in this paper require a small interleaver delay (to allow use in packet transmission systems with packet sizes ranging up to about 2048 bits) and a low number of decoding iterations for processing the constituent codes. They are robust in AWGN and Rayleigh fading channels, relatively easy to implement, and power and bandwidth efficient.

关键词： Turbo codes modulation coding Differential phase shift keying Frequency shift keying Bandwidth Rayleigh channels Convolutional codes Phase modulation Differential quadrature phase shift keying Phase detection

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Combined source-channel coding for transmission of H.263 coded video with trellis-coded modulation over a slow-fading Rician channel

Combined source-channel coding for transmission of H.263 cod...

引用

IEEE International Symposium on Information Theory

作者： M. Bystrom J.W. Modestino ECE Department Drexel University Philadelphia PA USA ECSE Department Rensselaer Polytechnic Institute Troy NY USA

In this work we consider the problem of combined source-channel coding for H.263 coded video transmitted over a wireless channel modeled as a slow-fading Rician channel. We use non-binary bandwidth-efficient trellis-coded modulation (TCM) employing appropriate phase-shift keyed modulation, and determine the optimal tradeoff between source and channel coding for the Rician channel as a function of the specular-to-diffuse energy ratio and the channel SNR. We show that if feedback on channel parameters is available, the video information can be optimally coded according to channel characteristics.

关键词： modulation coding Rician channels Channel coding AWGN channels Phase modulation Feedback Channel state information Interleaved codes Character generation Source coding

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Jointly optimised iterative source-coding, channel-coding and modulation for transmission over wireless channels

Jointly optimised iterative source-coding, channel-coding an...

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IEEE Conference on Vehicular Technology (VTC)

作者： S.X. Ng F. Guo J. Wang L.L. Yang L. Hanzo School of ECS University of Southampton UK

Joint source-coding, channel-coding and modulation schemes based on variable length codes (VLCs), trellis coded modulation (TCM), turbo TCM (TTCM), bit-interleaved coded modulation (BICM) and iteratively decoded BICM (BICM-ID) schemes are proposed. A significant coding gain is achieved without bandwidth expansion, when exchanging information between the VLC and the coded modulation decoders with the advent of iterative decoding. By using independent interleavers for the in-phase and quadrature-phase components of the complex-valued constellation, further diversity gain may be achieved. The performance of the proposed schemes is evaluated when communicating over both AWGN and Rayleigh fading channels. Explicitly, at BER=10/sup -5/ most of the proposed schemes have BER curves around 2 dBs away from the channel capacity limit.

关键词： modulation coding Fading AWGN Interleaved codes Labeling Iterative decoding Diversity methods Constellation diagram Bandwidth Vents

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